The Solvent Extraction of Alkali and Alkaline Earth Metal Ions with Nonionic and Ionic Surfactants Having Poly(oxyethylene) Chain
作者:Yukio Sakai、Masahiro Shinmura、Hajime Otsuka、Makoto Takagi
DOI:10.1246/bcsj.60.545
日期:1987.2
complex with the extractant. The overall extraction constant sequence was K+(10−9.15)>Rb+(10−9.26)>Cs+ (10−9.28)>Na+ (10−10.08)>Li+(10−10.36). The selectivity for K+, Na+, and Li+ was discussed by comparing the extraction behavior with a mixture of nonionic surfactant or dicyclohexano-18-crown-6 and a proton-dissociable lipophilic dye. For alkaline earth metal cations, the extractability decreased in the
使用衍生自聚乙二醇单[4-(1,1,3,3-四甲基丁基)苯基]醚(Triton X-100;平均氧乙烯基数,10 ) 通过在聚乙二醇链的羟基末端引入酚基(2-羟基-5-硝基苄基)。通过与萃取剂形成 1:1 的络合物,碱金属阳离子被萃取到 1,2-二氯乙烷中。总萃取常数顺序为K+(10-9.15)>Rb+(10-9.26)>Cs+(10-9.28)>Na+(10-10.08)>Li+(10-10.36)。通过比较非离子表面活性剂或双环己基-18-crown-6 和质子可解离亲脂性染料的混合物的萃取行为,讨论了 K+、Na+ 和 Li+ 的选择性。对于碱土金属阳离子,萃取性依次为Ba2+>Sr2+>Ca2+>>Mg2+。金属萃取性很大程度上取决于水相中阴离子的性质。